High-speed steam and air blower



T. M. EYNON HIGH SPEED STEAM AND AIR BLOWER Filed June 11. 1921 gnaw w? Nov. 1, 1927.

Patented Nov. 1, 1927.

a r g i V THOMAS.,M. EYNON, or riirLann'LPHIa; PE NSYLVANIA. a

nIGHsr ED STEAM Ann AIR BLOW'ERK Application fiieriaune 1921. SerialNo. 476,845.

' Myinvention relates to blast devices intended to combine the advantages of steam injectors and fans forthe cheap and efiective supply of air under pressure for forced draft in furnaces. I I

The main purpose of my invention is to increase the efficiency of the devicev at the same time that the supply of moisture is reduced.

A further purpose is to supply air under.

pressure to a preferably live steam air -injec tor system; r i

A further purpose to furnish a supply of air under'pressure through a manifold to a: plurality of furnace forced draft inlets and to accelerate the speed ofiair delivery at p these individual points as they may be sep arately required and at the same timevadd desirable moisture thereto by a live steam air injector in each connection from the manifold} Further purposes will appear in the specification and in the claims.

' by which these processes may be carried out.

My invention is intended to relate to the processes involved as Well as to mechanism I have preferred to-illustrate my invention by 'but one form of separate air and steam units for forced draft feed and but one form of combination units having air manifold supply for injectors, selecting forms which are practical, efficient, inexpensive and above all reliable and which at the same time well illustrate the principles of my invention.

Figurel is a longitudinal section showing a preferred form of a single unit fan anc high pressure steam injector.

Figure'2'is an end elevation of the fan. Figure 3 is a longitudinal section of a manifold and connections.

In the drawings similar numerals indicate 7 like parts.

I am aware of the fact that injectors have been used in connection with fans for supplying forced feed of air to furnaces. A patent upon one of these devices was taken out by me May 16, 1916, No. 1,182,665, in

conjunction with Messrs. Paine and Murphy. However, in this patent reliance was placed upon exhaust steam rather than-live steam, giving a relatively high percentage of moisture per unit of air delivered, the fan received the blast from the injector an'dboth the fan and the injector were of low enough efficiency to seriously affect their combination for the purpose" intended. The'fan'was shaft.

of what might be called a volumei type as a contradistinguished from a pressure type.

"Each of the changes'inadefrom this con- 811111051011 to my present form is advantageous V and their combinationi's particularly so.

Describing the forms'gof thepresent in 7 vention by way. of illustration and not in limitation V v I combine a fan of very high efficiencyand preferably of pressure type, shown at 5 with a'highly :etficient-live steam injector 6 to which the air from the: fan is led, "giving of airatthe rear'of the injector and upon a relatively high pressure and full volume which the injector operates as -its supply.- v

The form of fan which-I prefer to use, on account of its very high efiic encyand':

because of the relatively large diameter and high velocity of the cylinder of air deliv f cred by it, is that upon-which Patent No; :1,3Z2,7551ssued to Messrs. Kamp andIfMacmechen, having its-operating blades forming tangents to the radii about which the blades are bodily revolved]: I show'threeblades, 'l", 8 and9, supported upon shaft 10by rods 11. which areconnected to the shaft at 12 and 13 and are connectedutol the blades at' in bearings not shown and (is preferably anyp'oin'ts Handle The shaft is mounted :rigidavith' the shaft of a. motor'16here'shown as an electric motor. Any suitable mounting i 17 may. be used for thej.-1notor' and for its The fan is mounted within a casing 18 which affords an inlet to a chamber 19, with in which is located a livesteam injector, Th s in ector 13 shown as comprlsing any number of nozzles 20, 21,22, 23, 24' discharg,

ing each within the flared rear end 25, 26,

'27, 28, 29, ofthe next nozzle'in advance thereof andthe'final nozzle communicating with a delivery tube 30' connected withthe furnace beneath the grate. shown at 31, 32, 33, 84,35.

controlled by any suitable valve 37.

It will be evident that a fan of the character indicated having its effective blade sur faces; located wholly at some distance from The inlets are V 100. An injector is fed by alive steam pipe 36 the shaft about which they revolve will drive the air 'fro'mthe point at which it leaves the blades, discharging it initially within the space represented by a cylinderhaving a radii thickness equalto the differencebe ftween the' nside and outside radii ofthe" blades and an inside diameterequaljtothe inside diameter of the blades. The kinetic energy of the flow about this annulus will be exerted primarily upon the larger intake openings of the injector (those at the left hand end in Figure 1) because it corresponds most nearly in radius with the radii of these openings. The effect of this will be to reduce the fluidfriction upon theair which is driven the longest distance before being taken into the injector and to furnish this air to the injector at substantially the same pressure asthat at which it leaves the fan, equalizing the pressure to a large extent over all of the injector inlets and feeding the air freely at pressure within those inlets farthest from the fan and which by reason of thelarger diameter at this point offer intake for the largest quantity of air.

- In operation, the high efficiency and pressure fan drives the air to the various intakes so that the air is not dependent upon given quantity of steam inlet, reducing the moisture content to a minimum and at the same time securing a maximum of efficiency in the quantity of'air delivered for the energy expended.

In the form shown in Figure 3 a single fan is' used in connection with a number of furnaces, delivering its'blast of air into a 'manifold 40 from which it may bedirected into separate supply pipes 41, 42,43 or any of t-hem byropening corresponding valves, here typified as butterfly valves 44, 45, 46.

jectors to add the injector drive to the air blast.

It will be obvious that all or a part of my invention may be presented in other forms, as appeals to the'whim or need of those skilled in theart; and it is my purpose to include all such forms within my invention as come within its reasonable spirit and scope.

I claim as new and desire to secure by Letters Patent is i 1. In a draft'systein for furnaces, a casing, a live steam injector therein, adapted to entrain air having inlet openings increasing in size in the direction of steam travel, in combination with a fan supplying air to the injector under pressure and in a hollow cylindrical column comparable in diameter to that of the larger inlet openings.

2. In a draft system for furnaces, a casing, a live steam injector therein, adapted to entrain air and having a series of air inlets of cross-section increasing as they approach the discharge end f the injector, in combination With a fan having tangentially arranged blades discharging air to the injector.

, THOMAS M." En on i 55 Having thus described my invention, what 

